Sash-lock.



No. 768,730. PATENTED AUG. 30,1904

W. 0. BRINKERHOFF.

SASH LOCK.

APPLICATION FILED MAR- 22, 1901.

WITNESSES m VENTOH UNITED STATES Patented August 30, 1904.

WVILLIAM C. BRINKERHOFF, OF CHICAGO, ILLINOIS.

SASH-LOCK.

SPECIFICATION forming part of Letters Patent No. 768,730, dated August30, 1904.

Application filed March 22, 1901.

To all whom it may concern.-

Be it known that I, TILLIAM (l. BRINKER- HOFF, a citizen of the UnitedStates of America, and a resident of Chicago, in the county of Cook andState of Illinois, have invented certain new and useful Improvements inSash- Locks, of which the following is a specification.

The main object of my invention is to provide a sash-lock which willpermit of locking the window-sash when partly open and which can only beunlocked from the inside when the window is in its closed position.

I accomplish these objects by the device shown in the accompanyingdrawings, in

- which Figure l is a perspective View, partly broken away, of my deviceas applied to the lower sash of a window, the window being shown lockedin a partly-open position. Fig. 2 is a View of the device shown partlyin plan and partly in section. Fig. 3 is a side elevation of the lowerend of the guide.

In the form shown 1 is a window-frame, 2 is the lower sash of thewindow, 3 is a rail or guide secured to said window-sash in a positionparallel to one side of the frame. This guide is preferably made ofbulbed I-shaped section or T rail, having a flange isecured to thewindow-sash, a web 5 integral with said flange, and surmounted by anextended bulb or flange 6. At the lower end of the rail 3 the web 5 isswelled to form a shoulder 7. A hinged member 8 is secured to the frame1 by means of the plate 9. The standing end of said hinged member isforked or hooked to partly encircle the bulb 6 of said guide and isadapted to slide thereon until stopped by the shoulder 7 of the web ofsaid guide, thus permitting of opening the window for adistance equal tothe length of said guide while the device is in its locking position.The hinged member 8 is so situated with respect to the guide 3 that whenthe window-sash is in its Serial No. 52,318. (No model.)

closed position the fork 10 may be thrown in and out of engagement withthe guide by being swung on the pin 11.

To operate my device when applied to the lower sash of a window, it isonly necessary to swing the forked end 10 of the hinged member into linewith the guide 3 when the window is in its closed position. The windowmay now be raised until the lug 7 meets the prongs of the fork 10, andthus prevents further upward movement of the sash. To unlock the device,it will now be necessary to entirely close the sash before the forkedend of the hinged member can be thrown out of engagementwith the saidguide. To apply the device to the upper sash, the guide-rail may beinverted so that the shoulder 7 is at the upper end of said guide or thelocking members may be interchanged so that the guide-rail will be onthe window-frame.

It will be understood that some of the details of the device shown maybe altered without departing from the spirit of my invention. Itherefore do not confine myself to such details except as hereinafterlimited in the claim.

What I claim as my invention, and desire to secure by Letters Patent, is

In a sash-lock, the combination of a guide having two flanges connectedby a web in the form of a T-rail, the web at one end of said guide beingswelled to form a shoulder; a hinged member, comprising a flange towhich is hinged a forked arm adapted to span both of the flanges of saidguide and slide freely along said guide until stopped by the swelledportion of said web, said forked arm being adapted to be disengaged fromsaid guide.

Signed at Chicago this 20th day of March, 1901.

WILLIAM (J. BRINKERHOFF.

Witnesses:

EUGENE A. RUMMLER, WM. R. RUMMLER.

